A group of 5 numbers has an average of 30. The known numbers are 8, 12, 20, 30. What is the missing number?*
Question
A group of 5 numbers has an average of 30. The known numbers are 8, 12, 20, 30. What is the missing number?*
Solution
To find the missing number, you first need to find the total sum of all 5 numbers. You do this by multiplying the average by the total number of numbers.
So, 30 (average) * 5 (total numbers) = 150
Next, you add up the known numbers: 8 + 12 + 20 + 30 = 70
Then, you subtract the sum of the known numbers from the total sum of all numbers to find the missing number.
So, 150 (total sum) - 70 (sum of known numbers) = 80
Therefore, the missing number is 80.
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